Chime Warning System

CHIME WARNING SYSTEM

A chime warning system is standard factory-installed equipment. The chime warning system uses an electromechanical transducer, an electromechanical relay and an electromechanical buzzer that are soldered onto the electronic circuit board within the ElectroMechanical Instrument Cluster (EMIC) (also known as the Cab Compartment Node/CCN or KOMBI) to provide audible indications of various vehicle conditions that may require the attention of the vehicle operator or occupants.

The electromechanical transducer, relay and buzzer generate gong tones, click tones and buzzer tones that emulate the sounds associated with conventional announcement chimes, turn signal and hazard warning flasher clicking or warning buzzer operation. The microprocessor-based EMIC utilizes electronic chime request messages received from other modules in the vehicle over the Controller Area Network (CAN) data bus along with hard wired inputs to monitor many sensors and switches throughout the vehicle. In response to those inputs, the circuitry and programming of the EMIC allow it to control the audible outputs that are produced through its on-board transducer, relay and buzzer.

The EMIC is capable of producing the following audible outputs:

- Fast Rate Repetitive Click - Repeated click tones that are issued at a fast rate of more than about 100 clicks per minute.
- Slow Rate Repetitive Click - Repeated click tones that are issued at a slow rate of about 50 clicks per minute.
- Repetitive Gong - Repeated gong tones.
- Single Gong - A single gong tone.
- Warning Buzzer - An extended buzzer tone.

Hard wired circuitry connects the EMIC and the various chime warning system switch and sensor inputs to their modules and to each other through the electrical system of the vehicle. These hard wired circuits are integral to several wire harnesses, which are routed throughout the vehicle and retained by many different methods. These circuits may be connected to each other, to the vehicle electrical system and to the EMIC through the use of a combination of soldered splices, splice block connectors, and many different types of wire harness terminal connectors and insulators. Refer to the appropriate wiring information. The wiring information includes wiring diagrams, proper wire and connector repair procedures, further details on wire harness routing and retention, as well as pin-out and location views for the various wire harness connectors, splices and grounds.

The EMIC chime warning system circuits and components cannot be adjusted or repaired. If the EMIC circuitry or the on-board transducer, relay or buzzer are damaged or ineffective, the EMIC unit must be replaced.